var div = document.querySelector('div');
div.onmouseenter = function(){
    div.style.color = 'white';
    div.style.backgroundColor = 'black';
    div.style.border = '10px solid green'
}
div.onmouseout = function(){
    div.style.color = 'red';
    div.style.backgroundColor = 'white';
    div.style.border = '10px solid red'
}


var span = document.querySelector('span')
var lxx = document.getElementById('lxx')
span.onmouseout = function(){
    lxx.style.display = 'none';
}
span.onmouseover = function(){
    lxx.style.display = 'block';    
}


